CN103150072A - Touch device and touch method thereof - Google Patents

Abstract

The invention discloses a touch device and a touch method thereof. The touch device includes a touch panel, a signal generation unit, an inductor and a detection unit. The touch panel has multiple touch areas. The signal generating unit is used to generate driving signals. The inductor is coupled between the touch panel and the signal generating unit to transmit driving signals to these touch areas. The detection unit is coupled to the touch panel and the signal generation unit to receive multiple touch signals output from these touch areas, and calculates changes in capacitance values of these touch areas based on the output timing of the drive signals and these touch signals to detect the touch Touch points on the control panel. The frequency of the driving signal is the same as the resonant frequency of the reference capacitance value of the touch panel and the inductance value of the inductor. The invention can improve the sensing sensitivity of the touch device.

Description

Touch device and touch method thereof

technical field

The present invention relates to a touch device, and in particular to a capacitive touch device.

Background technique

In recent years, with the rapid development and progress of wireless mobile communications and information appliances, many information products have been replaced by traditional Input devices such as keyboards or mice are transformed into using touch panels (Touch Panel) as input devices. Wherein, since the touch detection effect of the capacitive touch panel is relatively good, a large number of touch technologies related to the capacitive touch panel emerge as the times require.

In the traditional touch sensing mechanism, a general touch sensing circuit (sensor IC) usually counts the charge and discharge times of the sensing capacitors with different capacitance values to determine whether the corresponding touch area is touched. For example, the touch sensing circuit can set a threshold value for the charge and discharge times. When the charge and discharge times are higher than the set threshold value, the touch sensing circuit judges that the corresponding touch area is touched, so as to In this way, the mechanism of touch sensing is realized. However, the sensitivity of the touch sensing mechanism using this method is low. If a touch method with a small contact area such as a stylus is used, the change in capacitance is smaller than that of a finger touch, which will make the touch sense The test circuit may produce misjudgment and cannot accurately determine whether the touch panel is touched.

Contents of the invention

In view of the above problems, the present invention provides a touch device, especially a capacitive touch device, which uses the principle of resonance to detect the change in the peak voltage of the touch signal to determine the change in capacitance of the touch panel, thereby enabling Improve the sensing sensitivity of the touch device.

The invention provides a touch device, including a touch panel, a signal generating unit, an inductor and a detection unit. The touch panel has multiple touch areas. The signal generating unit is used for generating driving signals. The inductance is coupled between the touch panel and the signal generation unit to transmit driving signals to these touch areas. The detection unit is coupled to the touch control panel and the signal generation unit to receive multiple touch signals output by these touch areas, and calculate the capacitance value changes of these touch areas according to the output timing of the driving signals and these touch signals, so as to detect touch touch points on the control panel. Wherein, the frequency of the driving signal is the same as the resonance frequency of the reference capacitance of the touch panel and the inductance of the inductor.

The present invention proposes a touch control method, including: sequentially transmitting drive signals to multiple touch areas of the touch panel through an inductor; receiving multiple touch signals output corresponding to these touch areas; and these touch signals, calculate the capacitance value changes of these touch areas; and detect the touch point of the touch panel according to the capacitance value changes of these touch areas.

The touch device of the embodiment of the present invention can calculate whether the capacitance value of each touch area on the touch panel changes according to the change of the peak voltage of the touch signal, and detect the touch points on the touch panel accordingly, and The sensing sensitivity of the touch device can be improved.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a touch device according to an embodiment of the present invention.

FIG. 2 is a schematic circuit diagram of a detection unit according to an embodiment of the present invention.

3A and 3B are schematic diagrams of signal waveforms of a touch device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a touch device according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of a touch device according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a touch method according to an embodiment of the present invention.

The reference numerals in the above-mentioned accompanying drawings are explained as follows:

100, 300, 400: touch device

110, 310, 410: touch panel

120, 320, 420: signal generation unit

130, 330, 430: detection unit

132: First multiplexer

134: Sampling amplifier

136: Sampling circuit

138: capacitance

140, 340, 440: inductance

350: second multiplexer

450: Third multiplexer

Ec1～Ecn: column electrodes

Er1～Erm: row electrodes

TA_11～TA_mn: touch area

SW1～SW4: switch

s_c: control signal group

s_d: drive signal

s_t1～s_tk: touch signal

s_t1a～s_t1b: waveform

V_p: peak voltage

V_pb: peak reference voltage

S600～S608: steps

Detailed ways

In order to improve the sensitivity of the capacitive touch panel, in the embodiment of the present invention, the resonance principle of the inductance and capacitance circuit is used to detect the touch points.

FIG. 1 is a schematic diagram of a touch device according to an embodiment of the present invention. Please refer to FIG. 1 , in this embodiment, the touch device 100 includes a touch panel 110 , a signal generation unit 120 , a detection unit 130 and an inductor 140 . The touch panel 110 has a plurality of touch areas TA_11˜TA_mn, wherein m and n are positive integers, which are determined according to the resolution requirement of the touch panel 110 . The signal generating unit 120 is used for generating the driving signal s_d. The inductor 140 is coupled between the touch panel 110 and the signal generating unit 120 to transmit the driving signal s_d to the touch areas TA_11˜TA_mn.

The detection unit 130 is coupled to the touch control panel 110 and the signal generation unit 120 . The detection unit 130 receives a plurality of touch signals s_t1˜s_tk outputted from the touch areas TA_11˜TA_mn, k is a positive integer, and the value of k can be designed according to the number of touch areas. Wherein, the detection unit 130 calculates the change of the capacitance value of the touch areas TA_11 - TA_mn according to the output timing of the driving signal s_d and the touch signals s_t1 - s_tk, and detects and outputs the touch point PT of the touch panel 110 accordingly, that is, the touch point PT. control position.

In this embodiment, the touch panel 110 is a capacitive touch panel. For a capacitive touch panel, each touch area is sensed by detecting the capacitance value of the corresponding touch area. to judge whether there is a touch event in the area.

From another point of view, the touch panel 110 can be, for example, a mutual capacitance touch panel or a self capacitance touch panel. Wherein, the mutual-capacitance touch panel corresponds to the change of the capacitance value of the mutual capacitance (mutual capacitor) between electrodes in the sensing touch panel to output sensing signals s_t1˜s_tk, while the self-capacitance touch panel is Sensing signals s_t1˜s_tk are output correspondingly to changes in the capacitance between each electrode (sensor pattern) in the touch panel and the ground (ground).

Specifically, in this embodiment, since the inductor 140 and the equivalent capacitances of the touch areas TA_11˜TA_mn in the touch panel 110 can be equivalent to a series circuit structure respectively, and the series circuit structure utilizes a resonant circuit (resonant circuit) circuit principle, when the equivalent capacitance value C of each untouched touch area TA_11~TA_mn and the inductance value L of the inductor 140 cancel each other out, it can be equivalent to a pure resistance circuit, and it is called the drive signal s_d Frequency is the resonant frequency of the resonant circuit:

$\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}\sqrt{\mathrm{<span\; class="notranslate">\; LC</span>}}$

That is to say, the equivalent impedance of the series circuit structure is determined in response to the inductance L of the inductor 140 and the equivalent capacitance C of the corresponding touch areas TA_11 -TA_mn. In this embodiment, since the inductance L of the inductor 140 is fixed, and the capacitance of the touch panel changes in response to whether the touch areas TA_11˜TA_mn are touched, the corresponding capacitance of each touch area TA_11˜TA_mn The equivalent impedance will change correspondingly in response to the change of the equivalent capacitance C of each touch area TA_11˜TA_mn, and corresponding to the peak voltage of the touch signals s_t1˜s_tk measured by each touch area TA_11˜TA_mn will also change accordingly. In other words, the peak voltage changes of the touch signals s_t1 - s_tk will be related to the capacitance changes of the touch areas TA_11 - TA_mn.

In detail, in the touch device 100 , the signal generating unit 120 can generate the driving signal s_d having the same frequency as the resonant frequency of the reference capacitance C and the inductance L of the inductor 140 when the touch panel 110 is not touched. In this embodiment, the reference capacitance value can be the average value of a plurality of capacitance values corresponding to the touch areas TA_11-TA_mn when they are not touched, or the touch areas TA_11-TA_mn when they are not touched The average value of the maximum capacitance value and the minimum capacitance value among the plurality of corresponding capacitance values respectively. In addition, in other embodiments, the reference capacitance value can also be the average value of the corresponding capacitance values when the touch areas TA_11-TA_mn are touched, or the sum of the corresponding capacitance values when the touch areas TA_11-TA_mn are touched. The average value of the maximum capacitance value and the minimum capacitance value, the reference capacitance value C also has other algorithms, the present invention does not repeat them, and the capacitance value that has not been touched is the reference capacitance value C.

According to the above, when the touch panel 110 is initialized, there will be no phase change between the driving signal s_d and the touch signals s_t1˜s_tk, that is, when the touch panel 110 is not touched and the frequency of the driving signal s_d is equal to the above-mentioned resonant frequency In this situation, the detection unit 130 may record the peak voltages of the touch signals s_t1˜s_tk as a plurality of peak reference voltages.

When the touch panel 110 is touched, and the touch signals s_t1˜s_tk and the driving signal s_d generate a phase shift (phase shift), the detection unit 130 will store the touch signals s_t1˜s_tk by capacitance, and the detection reaches a stable state. The peak voltage of the state, and according to when the capacitance change rate is less than 10%, the capacitance change is linearly positively correlated with the voltage change, so the capacitance change of the touch areas TA_11~TA_mn can be judged according to the peak voltage change. In other words, when any touch area TA_11˜TA_mn of the touch panel 110 is touched, the detection unit 130 can calculate the capacitance of the touch area TA_11˜TA_mn according to the peak voltage change of the corresponding touch signal s_t1˜s_tk. The value changes, and then detects and outputs the touch point PT of the touch panel 110 .

In addition, if the detection unit 130 judges that the capacitance change rate is greater than 10%, it can also control the switch (not shown) to select and switch the inductors coupled to different inductance values to match the capacitance change rate greater than 10%. For example, the range of the capacitance change rate is 10% to 20%, so that the capacitance change is linearly positively correlated with the voltage change, so the present invention is not limited thereto.

In order to further illustrate the touch sensing method of the embodiment of the present invention, FIG. 2 is a schematic circuit diagram of a detection unit according to an embodiment of the present invention. Referring to FIG. 2 , the detection unit 130 includes a first multiplexer 132 , a sampling amplifier 134 , a sampling circuit 136 and a switch SW1 . The first multiplexer 132 has a plurality of input terminals coupled to the touch panel 110 to respectively receive the corresponding touch signals s_t1˜s_tk, and the first multiplexer 132 has output terminals for sequentially outputting the touch signals s_t1˜s_tk.

The sampling amplifier 134 has a first input terminal, a second input terminal and an output terminal. The first input terminal of the sampling amplifier 134 is coupled to the output terminal of the first multiplexer 132 to receive the touch signals s_t1˜s_tk, and the second input terminal of the sampling amplifier 134 is coupled to the ground voltage GND.

The sampling circuit 136 is coupled to the output terminal of the sampling amplifier 134 to receive the amplified touch signals s_t1˜s_tk, wherein the sampling circuit 136 includes a capacitor 138 . The sampling circuit 136 is controlled by the control signal group s_c and utilizes the capacitor 138 to store the touch signals s_t1˜s_tk.

For example, the sampling circuit 136 can be realized by using the circuit structure of the switches SW2, SW3 and SW4 and the capacitor 138, wherein each switch SW2, SW3 and SW4 can be turned on or off according to the corresponding control signal in the control signal group s_c, The touch signals s_t1˜s_tk are sampled so that the capacitor 138 is charged in response to the touch signals s_t1˜s_tk, and the touch signals s_t1˜s_tk are stored accordingly. Wherein, the control signal group s_c and the control signals corresponding to each switch can be provided by the signal generating unit 120 .

Thereafter, the sampling circuit 136 can further output the touch signals s_t1˜s_tk stored in the capacitor 138 to an analog-to-digital converter (not shown) for back-end signal processing to detect and output the touch points of the touch panel 110 .

Here, the circuit structure of the sampling circuit 136 is just an example, and any circuit structure capable of sampling and holding the touch signals s_t1˜s_tk does not depart from the scope of the sampling circuit 136 of this embodiment.

In addition, FIGS. 3A and 3B are schematic diagrams of signal waveforms of a touch device according to an embodiment of the present invention. Here, the self-capacitive touch panel is taken as an example, and the driving and sensing of the touch area TA_11 is used for illustration. In the embodiment of FIG. 3A , the driving signal s_d is an example of a sine wave signal; in addition, in the embodiment of FIG. 3B , the driving signal s_d is an example of a square wave signal. In addition, in other embodiments, the driving signal s_d can also be a trapezoidal or triangular wave signal, which is not limited in the present invention.

Please refer to FIG. 1 and FIG. 3A at the same time. When the touch panel 110 is initialized, the touch area TA_11 generates a touch signal s_t1 corresponding to the untouched state according to the sinusoidal drive signal s_d (such as the waveform s_t1a shown), there is no phase difference between the touch signal s_t1 and the driving signal s_d at this time.

When the touch area TA_11 is touched, the equivalent capacitance value of the touch area TA_11 will change, and the equivalent impedance value can be calculated according to the following formula:

$\mathrm{<span\; class="notranslate">\; Z</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; C</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&omega;L</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&omega;\; C</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;fL</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;fC</span>}}<span\; class="notranslate">\; )</span>$

为电容的容抗值(单位:欧姆)Among them, X _L =2πfL is the inductance value of the inductor,

is the capacitive reactance value of the capacitor (unit: ohm)

And make the touch area TA_11 generate the touch signal s_t1 corresponding to the touched state according to the driving signal s_d (as shown in the waveform s_t1b), wherein the change of the equivalent capacitance makes the resonant circuit capacitive, so The touch signal s_t1 received by the detection unit 130 has a phase difference with the driving signal s_d. Therefore, the detection unit 130 can determine that the touch area TA_11 is touched based on the phase difference between the received touch signal s_t1 and the drive signal s_d, and output the corresponding touch point PT.

On the other hand, please refer to FIG. 1 , FIG. 2 and FIG. 3B at the same time. When the touch panel 110 is initialized, the touch area TA_11 generates a touch signal s_t1 corresponding to the untouched state according to the driving signal s_d ( As shown by the waveform s_t1a), the detection unit 130 receives the touch signal s_t1 and uses the sampling circuit 136 to charge the capacitor 138, and when it reaches a peak voltage in a steady state, it is defined as the peak reference voltage V_pb.

When the touch area TA_11 is touched, the equivalent capacitance of the touch area TA_11 will change, wherein the equivalent capacitance of the touch area TA_11 can be calculated using the above formula. At this time, the detection unit 130 will receive the touch signal s_t1 as shown in the waveform s_t1b. The detection unit 130 will use the sampling circuit 136 to charge the capacitor 138 based on the received touch signal s_t1, and calculate the capacitance value change of the touch area TA_11 when it reaches a stable peak voltage V_p and a peak reference voltage V_pb, Based on this, it is determined that the touch area TA_11 is touched and a corresponding touch point PT is output.

For example, when the touch area TA_11 is not touched, its capacitance value may be 5 pF, and the peak reference voltage recorded by the detection unit 130 may be 1.892 volts (V). When the touch area TA_11 is touched and the capacitance increases to 5.1 pF, the peak voltage of the touch signal s_t1 detected by the detection unit 130 will correspondingly increase to eg 1.994V. It can be seen that when the equivalent capacitance of the touch area TA_11 changes by 0.1 pF, the peak voltage of the touch signal s_t1 will correspondingly change by 102 millivolts (mV). In other words, the variation of the capacitance of the touch area TA_11 and the variation of the peak voltage of the touch signal s_t1 may be positively correlated within a specific variation interval (for example, the variation interval of the capacitance variation is less than 10%). The variation of the capacitance value and the variation of the peak voltage above are for illustration, which is determined according to the design of the touch panel. For an experiment example, the preset inductance value is 470 microhenries (Uh), such as 0.01pF A change in capacitance may correspond to a change in peak voltage of 10 millivolts, and a change in capacitance of 1 pF may correspond to a change in peak voltage of 1.125 volts. In addition, since the size of the inductor is positively correlated with the resonant frequency f, if the sensitivity of the touch panel is to be increased, the inductance value of the inductor can be increased.

Compared with the traditional touch sensing method that uses the charge and discharge times of the detection capacitance path to determine whether the touch areas TA_11˜TA_mn are touched, the touch device 100 of this embodiment can detect touch signals s_t1˜s_tk It is determined whether the touch areas TA_11˜TA_mn are touched according to the change of the peak voltage, thereby improving the sensing sensitivity of the touch device. In this way, even if the touch panel 110 is touched by a touch medium (such as a stylus) with a small touch area, the detection unit 110 can accurately detect the touch panel 110 according to the change of the peak voltage of the touch signals s_t1˜s_tk. It is judged whether the corresponding touch areas TA_11˜TA_mn are touched.

In the following description of the embodiment of FIG. 4 and FIG. 5 , the touch control device of the embodiment of the present invention will be described by taking mutual-capacity and self-capacity touch structures as examples respectively.

FIG. 4 is a schematic diagram of a touch device according to another embodiment of the present invention. Here, the touch panel 310 is a mutual capacitive touch panel, and is an example of a mutual capacitive touch panel having m rows and n columns of touch areas TA_11 - TA_mn. Wherein, the touch areas TA_11 - TA_mn are formed by overlapping areas of row electrodes Er1 - Erm arranged vertically and column electrodes Ec1 - Ecn arranged horizontally.

Referring to FIG. 4 , the touch device 300 includes a touch panel 310 , a signal generation unit 320 , a detection unit 330 , an inductor 340 and a second multiplexer 350 . Wherein, the operation modes of the signal generation unit 320 and the detection unit 330 are substantially the same as the signal generation unit 120 and the detection unit 130 shown in FIG. 1 , so they will not be repeated here.

In this embodiment, the second multiplexer 350 has an input terminal and a plurality of output terminals, the input terminal of the second multiplexer 350 is coupled to the inductor 340 to receive the driving signal s_d through the inductor 340, and the second multiplexer 350 The output ends of the electrodes are respectively coupled to the corresponding row electrodes Er1˜Erm (equivalent to being coupled to a column of touch areas). After the driving signal s_d generated by the signal generating unit 320 is transmitted to the second multiplexer 350 via the inductor 340 , the second multiplexer 350 provides the driving signal s_d to the touch areas TA_11 ˜ TA_1n and TA_21 of the touch panel 310 row by row. ˜TA_2n, . . . , TA_m1˜TA_mn, so that the touch panel 310 outputs touch signals s_t1˜s_tk corresponding to the touch areas TA_11˜TA_mn.

In detail, the signal generating unit 320 can provide the driving signal s_d to each row electrode Er1, Er2, . Ecn outputs touch signals s_t1˜s_tk corresponding to each touch area TA_11˜TA_1n, TA_21˜TA_2n, .

For example, when the driving signal s_d is provided to the row electrode Er1 through the second multiplexer 350 , each of the column electrodes Ec1˜Ecn will respond to the driving signal s_d on the row electrode Er1 and output signals respectively corresponding to the touch areas TA_11˜TA_1n. The touch signals s_t1˜s_tk, for example, the column electrode Ec1 outputs the touch signal s_t1 corresponding to the touch area TA_11, the column electrode Ec2 outputs the touch signal s_t2 corresponding to the touch area TA_12, and so on. Next, after the detection unit 330 receives the touch signals s_t1 -s_tk corresponding to the touch areas TA_11 -TA_1n, the driving signal s_d is provided to the row electrode Er2 in response to the switching of the second multiplexer 350 . Similarly, the column electrodes Ec1-Ecn output touch signals s_t1-s_tk respectively corresponding to the touch areas TA_21-TA_2n, for example, the column electrode Ec1 outputs the touch signal s_t1 corresponding to the touch area TA_21, and the column electrode Ec2 outputs the touch signals corresponding to the touch area TA_21. The touch signal s_t2 of the touch area TA_22, and so on. In this way, the second multiplexer 350 will switch sequentially according to the above method and provide the driving signal s_d to each row of electrodes Er1-Erm, so that the detection unit 330 can obtain the touch corresponding to each touch area TA_11-TA_mn Signals s_t1~s_tk.

On the other hand, the second multiplexer 350 can also provide the driving signal s_d row by row in reverse order, for example, provide the driving signal s_d to the row electrodes Erm, Erm-1, . . . , Er2, Er1 in sequence.

In addition, in other embodiments, the touch panel 310 can also be driven by a self-capacitive sensing method. For example, the second multiplexer 350 can further provide the driving signal s_d to each row electrode Er1˜Erm in sequence, and then provide the driving signal s_d to each column electrode Ec1˜Ecn in sequence, so that each row electrode Er1˜Erm Erm and each row of electrodes Ec1 - Ecn respectively respond to the received driving signal s_d to return touch signals s_t1 - s_tk. Then, the detection unit 330 can receive touch signals s_t1˜s_tk generated by each row electrode Er1˜Erm and each column electrode Ec1˜Ecn.

In the touch panel 310, the capacitance values corresponding to the touch areas TA_11˜TA_mn will vary depending on whether they are touched, and the peak voltages of the touch signals s_t1˜s_tk will correspond to the capacitance values of the touch areas TA_11˜TA_mn respectively. Decide. Therefore, the detection unit 330 can calculate the change of the capacitance values of the touch areas TA_11 - TA_mn according to the difference between the peak voltages of the touch signals s_t1 - s_tk and the peak reference voltage, and detect the touch point of the touch panel 310 accordingly. That is, it is detected whether the touch areas TA_11˜TA_mn are touched.

On the other hand, FIG. 5 is a schematic diagram of a touch device according to another embodiment of the present invention. Here, the touch panel 410 is a self-capacitive touch panel, and is also an example of a self-capacitive touch panel having m rows and n columns of touch areas TA_11 - TA_mn. Wherein, the touch areas TA_11 - TA_mn are electrode areas respectively corresponding to a plurality of electrodes arranged in an array.

Referring to FIG. 5 , the touch device 400 includes a touch panel 410 , a signal generation unit 420 , a detection unit 430 , an inductor 440 and a third multiplexer 450 . Wherein, the operation modes of the signal generation unit 420 and the detection unit 430 are substantially the same as the signal generation unit 320 and the detection unit 330 shown in FIG. 1 , so they will not be repeated here.

In this embodiment, the third multiplexer 450 has an input terminal and a plurality of output terminals, the input terminal of the third multiplexer 450 is coupled to the inductor 440 to receive the driving signal s_d through the inductor 440, and the third multiplexer 450 The output terminals of the two are respectively coupled to the touch control areas TA_11˜TA_mn. After the driving signal s_d generated by the signal generation unit 420 is transmitted to the third multiplexer 450 through the inductor 440, the third multiplexer 450 will sequentially provide the driving signal s_d to each touch area TA_11˜TA_mn, so that each touch The areas TA_11˜TA_mn output corresponding touch signals s_t1˜s_tk.

In detail, the signal generating unit 320 can sequentially provide the driving signal s_d to the touch areas TA_11 -TA_mn of the touch panel 410 through switching of the third multiplexer 450 . For example, the third multiplexer 450 can be switched sequentially to provide the driving signal s_d to each touch area (such as TA_11, TA_12, . . . , TA_1n) of the first row, and then provide the driving signal s_d to the Each touch area (such as TA_21~TA_2n), and so on for the rest. Moreover, the direction in which the driving signal s_d is provided to each touch area of each row can be switched from left to right in the figure, from right to left in the figure, or switched from left to right in the middle of the figure to the touch panel 410 Peripherals can be designed by themselves according to common knowledge in the field.

In addition, the above-mentioned driving signal s_d is provided in order from the first row, the second row to the last row, but in other embodiments, the driving signal s_d is provided in the order from the last row to the first row. This is the limit.

On the other hand, the third multiplexer 450 can also be switched sequentially to provide the driving signal s_d to each touch area (such as TA_11, TA_21, . . . , TA_m1) of the first column, and then provide the driving signal s_d to the second column. Each of the touch areas (such as TA_12~TA_m2), and the rest are listed in this way. Moreover, the direction in which the driving signal s_d is provided to each touch area of each row can be switched from the top to the bottom of the figure, from the bottom to the top of the figure, or from the middle of the figure to the periphery of the touch panel 410 up and down, which It can be designed by itself according to common knowledge in the field.

In addition, the above-mentioned driving signal s_d is provided in order from the first column, the second column to the last column, but in other embodiments, the driving signal s_d is provided in the order from the last column to the first column. This is the limit.

Furthermore, the order in which the above-mentioned driving signal s_d is provided to the corresponding touch areas TA_11˜TA_mn is for teaching, and those skilled in the art can set it by themselves to make the third multiplexer in any driving order. The device 450 correspondingly provides the driving signal s_d to the corresponding touch areas TA_11˜TA_mn, and the present invention is not limited thereto.

For the self-capacitive touch panel 410, the capacitance values corresponding to the touch areas TA_11˜mn will vary depending on whether they are touched, and the peak voltages of the touch signals s_t1˜s_tk will correspond to the touch areas TA_11˜ It is determined by the capacitance value of TA_mn. Therefore, the detection unit 430 can calculate the change of the capacitance values of the touch areas TA_11 - TA_mn according to the difference between the peak voltages of the touch signals s_t1 - s_tk and the peak reference voltage, and detect the touch points of the touch panel 410 accordingly. That is, it is detected whether the touch areas TA_11˜TA_mn are touched.

It should be noted that, in this embodiment, the detection unit 430 receives the driving signal s_d and the touch signals s_t1˜s_t1k through different transmission paths. However, in an embodiment of the present invention, the detection unit 430 can receive the touch signals s_t1˜s_tk through the same transmission path as the driving signal s_d, that is, after the touch areas TA_11˜TA_mn receive the driving signal s_d through the corresponding transmission path, Correspondingly, the touch signals s_t1˜s_tk are returned to the detection unit 430 through the same transmission path.

FIG. 6 is a schematic diagram of a touch method according to an embodiment of the present invention. Please refer to FIG. 6 , in step S600, firstly, the driving signal (such as the driving signal s_d) is sequentially transmitted to the touch points of the display panel (such as the touch panel 110, 310 or 410) through the inductor (such as the inductor 140, 340 or 440). control area. Then, after the touch area receives the driving signal, each touch area will generate and output a plurality of touch signals (such as touch signals s_t1˜s_tk) in response to the driving signal, so that the detection units (such as the detection units 130, 330 or 430) receiving a touch signal output by the touch area (step S602). Next, after the detection unit calculates the change in the capacitance value of the touch area according to the output timing of the driving signal and the touch signal (step S604), the detection unit will further detect the change in the capacitance value of the touch panel according to the change in the capacitance value of the touch area. control point (step S606).

In addition, the detailed steps of transmitting the driving signal to the touch area through the inductor (step S600) and calculating the capacitance value change of the touch area (step S606) can refer to the above-mentioned embodiments in FIG. 1 to FIG. 5, so here No longer.

To sum up, the touch device of the embodiment of the present invention can calculate whether the capacitance value of each touch area on the touch panel changes according to the change of the peak voltage of the touch signal, and detect the capacitance value on the touch panel accordingly. touch point, and can improve the sensing sensitivity of the touch device.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention should be determined by the scope defined by the appended claims.

Claims (14)

1. contactor control device comprises:

One contact panel has a plurality of touch areas;

One signal generation unit drives signal in order to produce one;

One inductance is coupled between this contact panel and this signal generation unit, to transmit this driving signal to those touch areas; And

One detecting unit, couple this contact panel and this signal generation unit, to receive a plurality of touching signals of described a plurality of touch areas output, and calculate the capacitance variation of described a plurality of touch areas according to this output timing and described a plurality of touching signals that drives signal, to detect a touch point of this contact panel;

Wherein, the resonance frequency of the inductance value of this frequency that drives signal reference capacitance value that is this contact panel and this inductance.

2. contactor control device as claimed in claim 1, wherein this detecting unit comprises:

One first multiplexer has a plurality of input ends and couples this contact panel with described a plurality of touching signals of reception correspondence respectively, and has an output terminal sequentially to export described a plurality of touching signals;

One sampling amplifier has a first input end, one second input end and an output terminal, and this first input end couples this output terminal of this first multiplexer to receive described a plurality of touching signals, and this second input end couples a ground voltage;

One sample circuit couples this output terminal of this sampling amplifier to receive the described a plurality of touching signals after amplifying, in order to the crest voltage of the described a plurality of touching signals of taking a sample.

3. contactor control device as claimed in claim 1, wherein this detecting unit is according to the capacitance variation of crest voltage change calculations described a plurality of touch areas of described a plurality of touching signals.

4. contactor control device as claimed in claim 3, wherein work as this contact panel in not being subjected to the touching state, the crest voltage of described a plurality of touching signals is a plurality of peak value reference voltages, in being subject to the touching state, this detecting unit judges the capacitance variation of described a plurality of touch areas according to the crest voltage of described a plurality of peak value reference voltages and described a plurality of touching signals when this contact panel.

5. contactor control device as claimed in claim 1, wherein this contact panel is a mutual appearance formula contact panel, and this touching signals provides line by line to described a plurality of touch areas.

6. contactor control device as claimed in claim 5, also comprise one second multiplexer, has an input end and couple this inductance receiving this driving signal by this inductance, and have described a plurality of touch areas that a plurality of output terminals couple respectively delegation.

7. contactor control device as claimed in claim 1, wherein this contact panel is a self-tolerant contact panel.

8. contactor control device as claimed in claim 7, also comprise one the 3rd multiplexer, has an input end and couple this inductance receiving this driving signal by this inductance, and have a plurality of output terminals and couple respectively described a plurality of touch area.

9. contactor control device as claimed in claim 1, wherein this reference capacitance value is the mean value of capacitance corresponding to described a plurality of touch area.

10. contactor control device as claimed in claim 1, wherein this reference capacitance value is a maximum capacitor value of capacitance corresponding to described a plurality of touch area and the mean value of a position of minimum capacitance.

11. contactor control device as claimed in claim 1, wherein this driving signal is sine wave, square wave, trapezoidal one of them of triangular wave of involving.

12. a touch control method comprises:

Drive with one a plurality of touch areas that signal is orderly sent to a contact panel by an inductance;

Receive a plurality of touching signals of corresponding described a plurality of touch areas output;

Drive output timing and described a plurality of touching signals of signal according to this, calculate the capacitance variation of described a plurality of touch areas; And

According to the capacitance variation of described a plurality of touch areas, detect a touch point of this contact panel.

13. touch control method as claimed in claim 12, wherein according to output timing and described a plurality of touching signals of this driving signal, the step of calculating the capacitance variation of described a plurality of touch areas comprises:

Capacitance variation according to crest voltage change calculations described a plurality of touch areas of described a plurality of touching signals.

14. touch control method as claimed in claim 13, wherein the step according to the capacitance variation of crest voltage change calculations described a plurality of touch areas of described a plurality of touching signals comprises:

This contact panel is not subjected to the crest voltage of the described a plurality of touching signals under the touching state as a plurality of peak value reference voltages; And

Judge the capacitance variation of described a plurality of touch areas according to the crest voltage of described a plurality of peak value reference voltages and described a plurality of touching signals.

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